Dictionary.net

Amorphous alkaloid, the by-product of quinine.

[Latin] Quinoidine; a mixture of alkaloids occurring as a by-product after the extraction of quintile, cinchonine, cinchonidine, and other crystallizable alkaloids from cinchona. Used as a substitute for quinine; dose, 10 gr. (gm. 0.60).

An amorphous alkaloidal precipitate from cinchona; antiperiodic.

A mixture of impure alkaloids left after the crystallization of quinin from the extract of cinchona, now rarely used therapeutically.